package com.company;
import java.util.ArrayList;
import java.util.Arrays;
public class Demo01 {
private static void main(String[]args){
String [] str =new String[]{"11","22"};
str[0]="111";
str[1]="222";
str[2]="333";
//删除位置为1的元素
str[1]=str[2];
str[2]=null;
ArrayListlist =new ArrayList<>(99999999); //数组列表 底层是数组
list.add("111");
list.add("222");
list.add("333");
list.add("444");
list.add("555"); //增加
System.out.println(list);
list.remove(1); //删除
list.remove("444");
System.out.println(list);
list.set(2,"55555"); //修改
System.out.println(list);
//查询
for (String l : list){
System.out.println(l+"\t");
}
System.out.println();
for (int i =0 ;i< list.size();i++) {
System.out.println(list.get(i)+"\t");
}
}
}
